[Mac] CREDENTIAL: Fix chooser dialog after r380352

chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/cocoa/passwords/password_prompt_view_bridge.h"
 
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_sheet.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_window.h"
 #import "chrome/browser/ui/cocoa/passwords/account_chooser_view_controller.h"
@@ skipping 51 matching lines @@
       GetRequestContext();
 }
 
 void PasswordPromptViewBridge::ShowWindow() {
   // Setup the constrained window that will show the view.
   base::scoped_nsobject<NSWindow> window([[ConstrainedWindowCustomWindow alloc]
       initWithContentRect:[[view_controller_ view] bounds]]);
   [window setContentView:[view_controller_ view]];
   base::scoped_nsobject<CustomConstrainedWindowSheet> sheet(
       [[CustomConstrainedWindowSheet alloc] initWithCustomWindow:window]);
-  constrained_window_.reset(
-      new ConstrainedWindowMac(this, web_contents_, sheet));
+  constrained_window_ =
+      CreateAndShowWebModalDialogMac(this, web_contents_, sheet);
 }
 
 AccountChooserPrompt* CreateAccountChooserPromptView(
     PasswordDialogController* controller, content::WebContents* web_contents) {
   return new PasswordPromptViewBridge(controller, web_contents);
 }
 
 AutoSigninFirstRunPrompt* CreateAutoSigninPromptView(
     PasswordDialogController* controller, content::WebContents* web_contents) {
   return new PasswordPromptViewBridge(controller, web_contents);
 }